#0  0xb6896548 in __attempt_transmit (data=0x823dea8) at chan_iax2.c:1845
1845                                                            if (iaxs[callno]->owner)
(gdb) bt full
#0  0xb6896548 in __attempt_transmit (data=0x823dea8) at chan_iax2.c:1845
       fr = {frametype = AST_FRAME_CONTROL, subclass = 1, datalen = 0,
 samples = 0, mallocd = 0, mallocd_hdr_len = 0, offset = 0, src = 0x0,
 data = 0x0, delivery = {tv_sec = 0, tv_usec = 0}, frame_list = {next = 0x0},
 has_timing_info = 0, ts = 0, len = 0, seqno = 0}
       f = <value optimized out>
       freeme = <value optimized out>
       callno = <value optimized out>
       __PRETTY_FUNCTION__ = "__attempt_transmit"
#1  0xb68abd43 in iax2_process_thread (data=0x81c0b78) at chan_iax2.c:7665
       _buffer = {__routine = 0xb68866b0 <iax2_process_thread_cleanup>,
 __arg = 0x81c0b78, __canceltype = 135561384, __prev = 0xb671643c}
       thread = <value optimized out>
       ts = {tv_sec = -1223214782, tv_nsec = -1222388544}
       put_into_idle = <value optimized out>
#2  0x080f4510 in dummy_start (data=0x81ba2a0) at utils.c:545
       _buffer = {__routine = 0x806a020 <ast_unregister_thread>,
 __arg = 0xb6716bb0, __canceltype = 0, __prev = 0x0}
       ret = <value optimized out>
#3  0xb7f330bd in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#4  0xb71d992e in clone () from /lib/tls/libc.so.6
No symbol table info available.